This is 2 Pairs of Kadee® #28 Magne-Matic® Couplers. FEATURES: Precision engineered multi-purpose insulated coupler kit. Simple drop in design. 20-Series coupler medium (19/64") centerset shank. Designed for Talgo-mounted draft gear boxes or body mounted. Very strong plastic isolated couplers and truck adaptors. Insulated universal adaptor plates. Insulated draft gear boxes and lids with side and center screw holes for mounting. Plastic .055" and .100" inner diameter sleeve adaptors for use with existing gear boxes. May be mounted from the top or mounted from the bottom. Bronze centering springs. The most functional & reliable knuckle couplers on the market! Very detailed instructions. Made in the USA. INCLUDES: (4) 20 Series Couplers (4) #5 Draft Gear Boxes & Covers (4) Universal Adaptor Plates (8) Sleeve Adaptors (4) Talgo Truck Adaptors (4) Centering Springs REQUIRES: Assembly Coupler Pliers (KADU0237) Hobby File Grease-em (KADU0231) SPECS: Scale: HO 1:87 kr9/8/06